6. Patients with pre-existing hepatic impairment: The screening for total bilirubin >25.7 µmol/L (1.5 mg/dL) will be done by the oncologist to qualify for CXRT. The screening for > 2 times the upper limit of normal hepatotoxicity, alkaline phosphatase (ALP), and alanine aminotransferase (ALT) or aspartate aminotransferase (AST) will be done by the oncologist to qualify for CXRT.